Diary of a Magnetic Survey of a Portion of the Dominion of Canada, Chiefly in the North-Western ...
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University of Toronto - Gerstein Science Information Centre
Diary of a magnetic survey of a portion of the dominion of Canada chiefly in the North-Western territories executed in the years 1842-1844
by Lefroy, J. H. (John Henry), Sir, 1817-1890
University of Alberta Libraries - The CIHM Monograph Collection
Diary of a magnetic survey of a portion of the Dominion of Canada, chiefly in the North-Western Territories [microform] : executed in the years 1842-1844
by Lefroy, John Henry, Sir, 1817-1890